Abstract
In this research, humic acid was selected as a typical organic substance in reclaimed water, and the effects of higher oxidation of UV/Cl2 and UV/PDS on its chemical composition, including aromaticity, molecular weight and fluorescence characteristics were investigated. Results showed that under the same oxidation conditions, the UVA254 removal rate of UV/Cl2 was higher than that of UV/PDS, but with the increase of pH, the UVA254 removal rate of both decreased. Increasing the oxidant concentration could improve the UVA254 removal rate, but UVA254 would not continue to decrease after a certain concentration (Cl2 0.5mM, PDS 0.75mM). After oxidation, organics whose molecular weight >6520 Da significantly decreased, molecular weight 350-1690 Da significantly increased, with increasing UV dose, the molecular weight of 350-1690 Da decreased in UV/Cl2, but continued to increase in UV/PDS. The fluorescent regions of fulic acids under different treatments were effectively degraded after oxidation. The degradation efficiency of UV/Cl2 and UV/PDS reached 87.6% and 83.3% respectively with 0.75mM oxidant and 1500 mJ/cm2 UV light.
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